Complex scaling method for three- and four-body scattering above the break-up thresholds

A formalism based on the complex-scaling method is presented to solve the few particle scattering problem in configuration space using bound state techniques with trivial boundary conditions. Several applications to A=3,4 systems are presented to demonstrate the efficiency of the method in computing elastic as well as break-up reactions with Hamiltonians including both short and long-range interaction.Comment: FB20 conference proceeding

Modelling double charge exchange response function for tetraneutron system

This work is an attempt to model the $4n$ response function of a recent RIKEN experimental study of the double charge exchange $^4$He($^8$He,$^8$Be)$^4$n reaction in order to put in evidence an eventual enhancement mechanism of the zero energy cross section, including a near-threshold resonance. This resonance can indeed be reproduced only by adding to the standard nuclear Hamiltonian an unphysically large T=3/2 attractive 3n-force which destroys the neighboring nuclear chart. No other mechanisms like cusps or related structures were found

Solutions of the Wick-Cutkosky model in the Light-Front Dynamics

We study relativistic effects in a system of two scalar particles interacting via a scalar exchange in the Light Front Dynamcis framework. The results are compared to those provided by Bethe-Salpeter and non relativistic equations. It is found in particular that for massive exchange, the relativistic description is of crucial importance even in the limit of zero binding energy. PACS: 11.10, 03.70, 03.65P Keywords: Light-Front Dynamics, Relativistic equations, Quantum Field TheoryComment: 12 pages, 11 figures, Latex.tar.gz file Accepted in Phys. Lett.

Si jo fos candítat.. A propòsit del 14-M i l'educació

Abstract not availabl

Chordal cubil systems

We classify the phase portraits of the cubic systems in the plane such that they do not have finite critical points, and the critical points on the equator of the Poincaré sphere are isolated and have linear part nonidentically zero

Decàleg d'un bon ministre d'Educació

Abstract not availabl